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金厂特大型金矿床产于吉黑东部兴凯地块太平岭隆起与老黑山断陷的交接部位,矿区外围出露新元古界黄松群变质岩系。本区燕山期岩浆活动可分为5期,分别为燕山早期第一阶段闪长岩(δ52-1)、燕山早期第二阶段文象花岗岩(γo52-2)、燕山早期第三阶段花岗岩(γ52-3)、燕山晚期第一阶段花岗斑岩(γπ53-1)、燕山晚期第二阶段闪长玢岩脉(δμ53-2),形成岩浆穹窿型构造和隐爆角砾岩筒构造,并叠加大规模的热液蚀变活动,金矿化与第4、5期岩浆活动紧密相关。金矿矿体产状有三种类型:岩浆穹窿构造型、隐爆角砾岩型和环状放射状断裂型。矿石类型主要有含金黄铁矿化石英脉、含金石英黄铁矿脉、含金多金属硫化物石英脉、含金黄铁矿化方解石脉等。金矿成矿年龄为119.40 -122.53 Ma。金矿体受统一的构造-岩浆流体蚀变系统控制,成矿物质来源于深部,成矿流体为岩浆水,晚阶段有少量大气水加入。成矿环境为中高温、中等压力,流体盐度为中等偏高,流体性质为弱碱性、弱还原性,属于K+-Na+- Ca2+-Cl--SO42-型流体。金在成矿流体中以[Au(HS)2]-、[AuCl2]-、[Au(CO3)]-及[Au(HCO3)2]-等络合物形式存在,当温度、压力下降时,溶液由酸性演化为弱酸性再到弱碱性时,络合物离解,金沉淀成矿。
The gold factory extra large gold deposit is produced at the junction of the Taipingling uplift of the Xingkai block in eastern Kyrgyzstan and the old Montenegro faulting. The outer metamorphic rocks of the Neoproterozoic Huangsong group are exposed on the periphery of the mining area. The Yanshanian magmatic activity in this area can be divided into five stages, namely the first stage of early Yanshanian diorite (δ52-1), the second stage of Yanshanian granite (γo52-2), the third stage of Yanshanian granite (γ52 -3), granite porphyry in the first stage of Late Yanshanian (γπ53-1) and diorite veins (δμ53-2) in the second stage of Late Yanshanian, forming magmatic dome structures and cryptoexplosive breccia structures Superimposed large-scale hydrothermal alteration activities, gold mineralization is closely related to the 4th and 5th magmatic activities. There are three types of gold orebody occurrences: magmatic dome structure, crypto-explosive breccia type and annular radial fracture type. The ore types are mainly gold-bearing pyrite fossil veins, gold-bearing quartzite veins, gold-bearing polymetallic sulfide quartz veins and gold-bearing pyrite veins. The gold mineralization age is 119.40 -122.53 Ma. The gold ore body is controlled by a unified tectonic-magmatic fluid alteration system. The ore-forming material comes from the deep part and the ore-forming fluid is magmatic water. In the late stage, a small amount of atmospheric water is added. The ore - forming environment is medium - high temperature and moderate pressure, and the fluid salinity is moderately high. The properties of the fluids are weakly basic and weakly reducing, belonging to K + -Na + - Ca2 + -Cl - SO42- type fluid. Gold exists in the form of complexes of [Au (HS) 2] -, [AuCl2] -, [Au (CO3)] - and [Au (HCO3) 2] - in the ore- forming fluid and when the temperature and pressure drop , The solution evolved from acidic to weakly acidic to weakly alkaline, complex dissociation, gold precipitation mineralization.